Hapsburg or Habsburg, House of, a famous royal house which has played a leading part in the history of Continental Europe from its foundation in the 12th century by Albert, Count of Hapsburg, and which is represented to-day by the Imperial family of Austria. Representatives of this family wore the Imperial crown of the Holy Roman Empire for centuries. It takes its name from the castle of Habsburg or Habichtaburg, on the Aar, built by Werner, bishop of Strasburg, in the 11th century, a castle, however, which has long since ceased to be in the possession of the family.